Method for the preparation of hydrophilic spongy gels

Details Method for the preparation of hydrophilic spongy gels Method for the preparation of hydrophilic spongy gels

1974-01-21

1977-05-03

Tillman, Murray

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

3 1, 3 13, 32 10R, 55528, 128260, 128334R, 128349R, 131202, 131207, 138DIG7, 138DIG9, 138103, 210198, 210502, 260 21E, 260 25R, 260 296AN, 260 296AQ, 424 22, 526 23, 526 52, C08J 522, C08J 902

Patent

active

040213820

ABSTRACT:
A method for the preparation of a hydrophilic acrylonitrile-containing polymer comprising admixing a solution of said polymer in 47% to 75%, preferably 50 to 72% concentrated HNO.sub.3, with solid particles of a substance insoluble in said acid solution and soluble in water, aqueous solutions of said substance being operative to precipitate said polymer from said HNO.sub.3, shaping the mixture of the dissolved polymer with said solid substance to a desired physical shape, coagulating said shaped polymer in an aqueous medium and washing said solid particles out from the coagulated polymer, and articles made therefrom.
The added solid substance either may react with nitric acid forming a water-soluble nitrate, or it may remain in the mixture unchanged.

REFERENCES:
patent: 3375208 (1968-03-01), Duddy
patent: 3408315 (1968-10-01), Paine
patent: 3475355 (1969-10-01), Decker
patent: 3476844 (1969-11-01), Villain
patent: 3576686 (1971-04-01), Schmidle et al.
patent: 3577359 (1971-05-01), Carevic et al.
patent: 3709842 (1973-01-01), Stoy
patent: 3749685 (1973-07-01), Johnson et al.
patent: 3798188 (1974-03-01), Takizawa et al.
patent: 3816575 (1974-06-01), Susuki et al.
patent: 3897382 (1975-07-01), Stoy et al.

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